．When you look for a job, it’s not your book knowledge but your experience        ________matters more.

A．whether

B．which

C．what

D．that

目前最理想的永久性创面覆盖物是（）

A.表皮细胞膜片

B.猪皮

C.自体皮肤

D.鸡皮

E.同种异体皮